optee: cache argument shared memory structs

Implements a cache to handle shared memory used to pass the argument
struct needed when doing a normal yielding call into secure world.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

1 files changed, 24 insertions, 3 deletions

diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index e80c5d9b62ec..a33d98d17cfd 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -59,6 +59,16 @@ struct optee_notif {
 	u_long *bitmap;
 };
 
+#define OPTEE_SHM_ARG_ALLOC_PRIV	BIT(0)
+#define OPTEE_SHM_ARG_SHARED		BIT(1)
+struct optee_shm_arg_entry;
+struct optee_shm_arg_cache {
+	u32 flags;
+	/* Serializes access to this struct */
+	struct mutex mutex;
+	struct list_head shm_args;
+};
+
 /**
  * struct optee_supp - supplicant synchronization struct
  * @ctx			the context of current connected supplicant.
@@ -121,7 +131,7 @@ struct optee;
  */
 struct optee_ops {
 	int (*do_call_with_arg)(struct tee_context *ctx,
-				struct tee_shm *shm_arg);
+				struct tee_shm *shm_arg, u_int offs);
 	int (*to_msg_param)(struct optee *optee,
 			    struct optee_msg_param *msg_params,
 			    size_t num_params, const struct tee_param *params);
@@ -157,6 +167,7 @@ struct optee {
 		struct optee_smc smc;
 		struct optee_ffa ffa;
 	};
+	struct optee_shm_arg_cache shm_arg_cache;
 	struct optee_call_queue call_queue;
 	struct optee_notif notif;
 	struct optee_supp supp;
@@ -273,8 +284,18 @@ void optee_cq_wait_for_completion(struct optee_call_queue *cq,
 void optee_cq_wait_final(struct optee_call_queue *cq,
 			 struct optee_call_waiter *w);
 int optee_check_mem_type(unsigned long start, size_t num_pages);
-struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
-				  struct optee_msg_arg **msg_arg);
+
+void optee_shm_arg_cache_init(struct optee *optee, u32 flags);
+void optee_shm_arg_cache_uninit(struct optee *optee);
+struct optee_msg_arg *optee_get_msg_arg(struct tee_context *ctx,
+					size_t num_params,
+					struct optee_shm_arg_entry **entry,
+					struct tee_shm **shm_ret,
+					u_int *offs);
+void optee_free_msg_arg(struct tee_context *ctx,
+			struct optee_shm_arg_entry *entry, u_int offs);
+size_t optee_msg_arg_size(size_t rpc_param_count);
+
 
 struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz);
 void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm);